/*这是一个不同进程负责收发的客户端，父进程负责读，子进程负责写*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 30

void read_routine(int sock, char *buf)
{
    while (1)
    {
        int str_len = read(sock, buf, BUF_SIZE);
        if (str_len == 0)
        {
            return;
        }
        buf[str_len] = 0;
        printf("Message from server: %s", buf);
    }
}
void write_routine(int sock, char *buf)
{
    while (1)
    {
        fgets(buf, BUF_SIZE, stdin);
        if (!strcmp(buf, "q\n") || !strcmp(buf, "Q\n"))
        {
            shutdown(sock, SHUT_WR);
            return;
        }
        write(sock, buf, strlen(buf));
    }
}

int main(int argc, char **argv)
{
    int sock;
    pid_t pid;
    char buf[BUF_SIZE];
    sockaddr_in serv_adr;
    if (argc != 3)
    {
        printf("Usage: %s <IP> <port>\n", argv[0]);
        exit(1);
    }
    sock = socket(AF_INET, SOCK_STREAM, 0);
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_addr.s_addr = inet_addr(argv[1]);
    serv_adr.sin_port = htons(atoi(argv[2]));
    serv_adr.sin_family = AF_INET;

    connect(sock, (sockaddr *)&serv_adr, sizeof(serv_adr));
    pid = fork();
    if (pid == 0)
    {
        write_routine(sock, buf);
    }
    else
    {
        read_routine(sock, buf);
    }
    close(sock);
    return 0;
}